<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="test"></div>
    <script src="./js/react.development.js"></script>
    <script src="./js/react-dom.development.js"></script>
    <script src="./js/babel.min.js"></script>
    <script type="text/babel">
        class Login extends React.Component {
            username = React.createRef()
            password = React.createRef()
            handleSubimt = (event)=>{
                event.preventDefault();
                const {username, password} = this
                alert(username.current.value, password.current.value)
            }
            render() {
                return (
                    <form action="http://www.baidu.com/" onSubmit={this.handleSubimt}>
                        用户名：<input ref={this.username} type="text" name='username'/>
                        密码：<input ref={this.password} type="password" name='password'/>
                        <button>登录</button>
                    </form>
                )
            }
        }
        ReactDOM.render(<Login/>,document.getElementById("test"))
    </script>
</body>
</html>